VOA常速英语:Scientists Target Antibodies That Work Against Many HIV Mutations

短语讲解：

1. The search for a vaccine against HIV/AIDS has been disappointing, in part because the virus cleverly changes to elude the antibodies of the human immune system.

in part在某种程度上, 部分地
例句：Tom was only in small part responsible.
汤姆只有一小部分责任。

2. But the human immune system just isn't very good at fighting off an HIV infection, in part because the virus is constantly mutating.

good at擅长…
例句：I am good at English.
我擅长英语。
fight off竭力摆脱〔驱走, 阻止, 回避…〕
例句：This is a possible cure to fight off cancer.
这也许是治愈癌症的良方。

3. For HIV, current vaccines, because of the variability of the virus, don't induce antibodies that are able to recognize many different virus strains.

because of因为, 由于
例句：It was because of the job that he had taken the flat.
他因为工作的原因租了那套公寓。
be able to能,会
例句：Most children are able to walk before they are able to talk.
多数孩子在会说话前就会走路。

4. But Walker and her colleagues identified rare antibodies that were effective against a large number of the virus variations in circulation.

a large number of很多
例句：A large number of people were present.
很多人出席了。

5. In the lab, they mixed those antibodies with HIV and saw that the virus was neutralized, and a relatively small amount of antibodies did the trick.

mix with (使)与…混〔结〕合
例句：This paint mixes easily with water.
这种颜料容易与水混合。

6. "What's special about these antibodies is that they're able to inactivate the viruses at very low concentrations, which means that if you could induce these antibodies by a vaccine, you wouldn't need very much of them to provide some protection, which we think is very hopeful in terms of vaccine design,"  Walker says.

in terms of 就…而言, 从…方面说来
例句：He referred to your work in terms of high praise.
他对你的工作大加赞扬。

7. Walker says these molecules might be used as what she calls templates for potential vaccines.

be used as被…用作
例句：Dung is used as manure.
粪被用做肥料。

8. Walker is cautiously optimistic that her work may lead to an effective HIV vaccine.

lead to导致
例句：Smoking can lead to lung cancer.
抽烟可能导致肺癌。

9. However, she says her approach may help protect people who are newly exposed to HIV, but probably won't benefit those who already carry the virus.

expose to暴露于
例句：Don't expose undeveloped film to light.
不要把未冲洗的胶卷暴露在光照下。